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Brother LS2-B877 Instruction Manual Page 121

Single needle unison feed lock stitcher with large hook.
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Problem
7. Upper thread trimming
errors (-305)
8. Lower thread trimming
errors (-305)
9. Lower thread is tangled at
the sewing start.
Lower
thread
Spinning of bobbin
during thread
80%
trimming
(-305)
Is the timing correct during thread trimming?
Adjust the timing for thread trimming.
Are the tips of the movable knives damaged or bent?
Replace the movable knife which is damaged.
Is there too much clearance between the tips of the movable knives and
the rotary hook stoppers?
Adjust so that the clearance is 0.05 - 0.2 mm.
Is the tension release mechanism working correctly?
Adjust the tension release mechanism.
Are the tips of the movable knives in the correct positions?
Adjust the positions of the movable knives.
Are the tips of the movable knives too low?
Are the tips of the movable knives damaged or bent?
Replace the movable knife which is damaged.
Are the rotary hooks too high?
Push the rotary hooks down to install them correctly.
Is the bobbin spinning direction correct when the lower thread is being
pulled?
Set the bobbin so that it turns in the opposite direction to the rotary
hook.
Is there too much thread wound onto the bobbin?
The bobbin winding amount should not be more than 80%.
Is the anti-racing spring attached?
Attach the anti-racing spring.
Is the bobbin turning smoothly?
If the bobbin is not turning smoothly, replace the bobbin.
Is a bobbin other than the light-alloy bobbins specified by Brother being
used?
Use only bobbins which are specified by Brother.
LS2-B877, LT2-B878 (English)
15. TROUBLESHOOTING GUIDE
15. FEHLERSUCHE
15. RECHERCHES DE PANNES
15. GUIA PARA LA LOCALIZACION DE FALLAS
Where to check
Page
71
76
78 · 89
67
78 · 81
76
92
29 · 30
26
28
29 · 30
28
102

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This manual is also suitable for:

Lt2-b878

Comments to this Manuals

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Latest comments:
  • Rosa Martínez Jun 02, 2015 09:52:
    Necesito un Manual en español gracias
  • Maria Nieves Mar 10, 2015 04:50:
    maria1963@​gmail.com Por favor necesito el manual LS-2125i
  • #unknown Mar 21, 2014 06:52:
    POR FAVOR NECESITO EL MANUAL DE LA BROTHER LS2B837 MUCHAS GRACIAS.